What is the difference between direct current and alternating current?

All of the following are examples of mechanical energy except

The Emerald Suite is a revolving restaurant at the top of the Space Needle in Seattle, Washington. If a customer sitting 18 m from the restaurant's center has a tangential speed of 2.54 * 10-2 m/s, what is the angular speed of the restaurant?

The wavelength of light visible to the human eye is on the order of 5 x 10-7 m. if the speed of light in air is 3 x 108 m/s, find the frequency of the lightwave.

At t = 0 a car has a speed of 30 m/s. At t = 6 s, its speed is 14 m/s. What is its average acceleration during this time interval?

What is the relationship between temperature and density? a. temperature increases with an increase in density b. temperature and density are not affected by each other c. increases in temperature lead to a decrease in density d.

Is there such a thing as real time weather radar? why not?

Luke and Carrie are driving down a straight section of the interstate at 70 mph in Luke's new convertible. Carrie is drinking a soda in the passenger seat.

A force produces power p by doing work w in a time t. what power will be produced by a force that does six times as much work in half as much time?

A batter hits a baseball with a bat. The bat exerts a force on the ball. Does the ball exert a force on the bat?

In a nuclear power plant, the temperature of the water in the reactor is above 100°C because of what?